Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753412AbaAVU5V (ORCPT ); Wed, 22 Jan 2014 15:57:21 -0500 Received: from aserp1040.oracle.com ([141.146.126.69]:21769 "EHLO aserp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752358AbaAVU5S (ORCPT ); Wed, 22 Jan 2014 15:57:18 -0500 To: James Bottomley Cc: Ric Wheeler , "linux-scsi\@vger.kernel.org" , "linux-ide\@vger.kernel.org" , Chris Mason , "linux-kernel\@vger.kernel.org" , "linux-mm\@kvack.org" , "mgorman\@suse.de" , "linux-fsdevel\@vger.kernel.org" , "akpm\@linux-foundation.org" , "lsf-pc\@lists.linux-foundation.org" Subject: Re: [Lsf-pc] [LSF/MM TOPIC] really large storage sectors - going beyond 4096 bytes From: "Martin K. Petersen" Organization: Oracle References: <20131220093022.GV11295@suse.de> <52DF353D.6050300@redhat.com> <20140122093435.GS4963@suse.de> <52DFD168.8080001@redhat.com> <20140122143452.GW4963@suse.de> <52DFDCA6.1050204@redhat.com> <20140122151913.GY4963@suse.de> <1390410233.1198.7.camel@ret.masoncoding.com> <1390411300.2372.33.camel@dabdike.int.hansenpartnership.com> <1390413819.1198.20.camel@ret.masoncoding.com> <1390414439.2372.53.camel@dabdike.int.hansenpartnership.com> <52E00B28.3060609@redhat.com> <1390415703.2372.62.camel@dabdike.int.hansenpartnership.com> <52E0106B.5010604@redhat.com> <1390419019.2372.89.camel@dabdike.int.hansenpartnership.com> Date: Wed, 22 Jan 2014 15:57:01 -0500 In-Reply-To: <1390419019.2372.89.camel@dabdike.int.hansenpartnership.com> (James Bottomley's message of "Wed, 22 Jan 2014 11:30:19 -0800") Message-ID: User-Agent: Gnus/5.130005 (Ma Gnus v0.5) Emacs/24.2 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-Source-IP: ucsinet22.oracle.com [156.151.31.94] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org >>>>> "James" == James Bottomley writes: >> or even (not today, but some day) reject the IO. James> I really doubt this. All 4k drives today do RMW ... I don't see James> that changing any time soon. All consumer grade 4K phys drives do RMW. It's a different story for enterprise drives. The vendors appear to be divided between 4Kn and 512e with RMW mitigation. -- Martin K. Petersen Oracle Linux Engineering -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/